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Characterization of selenium tea polysaccharides from black tea.

Ziqi Qi1, Xiaofei Alex Duan2, Marc-Antoine Sani3

  • 1School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, VIC 3010, Australia.

Food Chemistry
|April 3, 2026
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Summary

Selenium-enriched tea polysaccharides (SeTPSs) were isolated from Se-rich black tea. These SeTPSs showed enhanced antioxidant activity and thermal stability compared to regular tea polysaccharides.

Keywords:
Antioxidant activitySe tea polysaccharidesSeleniumStructural characterizationTea selenium

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Area of Science:

  • Food Science
  • Biochemistry
  • Materials Science

Background:

  • Selenium (Se) is an essential trace element with vital biological functions.
  • Se-containing polysaccharides (Se-PS) are gaining attention for their unique structures and bioactivities.
  • Tea polysaccharides (TPSs) are known for their health benefits.

Purpose of the Study:

  • To isolate and characterize Se-enriched tea polysaccharides (SeTPSs) from Se-rich black tea.
  • To investigate the structural features, Se content, and bioactivities of SeTPSs.
  • To compare the properties of SeTPSs with regular TPSs.

Main Methods:

  • Isolation and purification of SeTPSs from Se-rich black tea.
  • Determination of Se content using ICP-QQQ-MS.
  • Characterization of SeTPSs including molecular weight, monosaccharide composition, structural features, conformation, thermal stability, and antioxidant activity.

Main Results:

  • SeTPSs were successfully isolated with Se content ranging from 146 to 572 ppb.
  • SeTPSs are heteropolysaccharides with Se integrated into the polysaccharide structure.
  • SeTPSs exhibited enhanced antioxidant activity and thermal stability compared to regular TPSs.
  • Se content, molecular structure, and antioxidant activity varied among SeTPSs fractions.

Conclusions:

  • Se-rich black tea is a viable source for producing SeTPSs.
  • SeTPSs possess improved antioxidant and thermal stability properties.
  • These findings contribute to understanding organoselenium macromolecules and their potential health benefits.